Stop valve



H. scHMlT'r Nov. l, 1932e l STOP VALVE Filed April 4, 1931 Patented Nov. 1, 19.32

UNITED STATES 'HEINRICH SCHMITT, OF WITTEN-ON-THE-RUHR, GERMANY sror VALVE Application led April 4, 1931, Serial No.

. eccentric as an operating member acting in axial direction upon the valve so that it moves t the valve away from its seat when being turned with its longitudinal axis in the direc-1 tion of the axis of the valve, the pressure medium being allowed to pass along both sides of thenarrow portion of the eccentric.

A11 embodiment of the invention is illus- 15 trated by way of example in'theaccompanying'drawing in which Y ig. 1 is a longitudinal section through the valve chest, the eccentric being shown in elevation. Fig. 2 is a longitudinal section taken at an ent position. F1g. 3 shows the eccentric operating lever in elevation.

The housing is composed of two parts a and b, the part a being constructed as a casing comprising a chamber c, in which an eccentric dis located. This eccentric is preferably of oval'shape and has on each side a circular guide disc lc. These guide discs 7c t each into a circularcavity e and are guided in these cavities. The eccentric d has further alateral extension m extending through a stuifing box n from the housing and carrying a lever o. A packingg in the stuing box n packs tightly the extension of the eccentric. A check valve f in the part b of the housingv is controlled by a spring i and pressed 4 against its seat bythe action of this spring and by the pressure of the com ressed air. The seat of the check valve f is ormed by a face g on the inlet to the casing a and which is adapted to be engaged by a packing disc 5 p on the valve plate f. A guide pin k extending from the check valveprojects into the 527,692, and in Germany July 2'5, 1930.

tion. The guide pin la has vertical groovesv in its outer circumference serving as passages for the compressed air. If the cock is adjusted so that the longitudinal axis of the eccentric l that is the longer diameter of the 55 oval formed by the -central plane of the eccentric is in alinement with the central axis of the valve, the valve is moved from its seat, and the compressed air can pass through the cock casing along the sides of the narrow ,60 portion of the eccentric. If the eccentric is turned 90, so that its longitudinal yaxis is standing transversely to the central axis of the valve, as shown in Fig. 2, the valve is' closed by the pressure of the compressed air and ofthe spring i. .7 The advantage of the arrangement consists in that the valve can be operated like a-cock,

vwithout any alteration ofthe characterof a 'check valve. 7 angle of 90 relative to the section shown in Fig. 1, the eccentric being shown in d-i'er- I claim j A stop valve for steam, water, gask and compressed air, especially for .pneumatic hammers, comprising in combination a casing having a circular cavity in two opposite sides, an'oval eccentric, circular'discs one on each side of said veccentric fitting into said circular cavities, a handle on said eccentric, a check valve projecting into said casing, said eccentric adapted to act in axial direction 8 upon said check valve and to move said valve away` from its seat so that the pressure medium .can pass through if said eccentric `is turned with its longitudinal axis in the axial direction of said check valve.-` 85 In testimony whereof I aiiix my signature.

casing a, the central axis of this guide pin being in alignment with the central axis of the eccentricd.

Fig. 1 shows the valve in the open posi- 

